CN102383773A - Method for exploiting coal bed gas by physical regional pressure relief - Google Patents
Method for exploiting coal bed gas by physical regional pressure relief Download PDFInfo
- Publication number
- CN102383773A CN102383773A CN2011101836642A CN201110183664A CN102383773A CN 102383773 A CN102383773 A CN 102383773A CN 2011101836642 A CN2011101836642 A CN 2011101836642A CN 201110183664 A CN201110183664 A CN 201110183664A CN 102383773 A CN102383773 A CN 102383773A
- Authority
- CN
- China
- Prior art keywords
- coal
- well
- water
- recovery well
- exploiting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for exploiting coal bed gas by physical regional pressure relief. The method comprises the following steps of: constructing two groups of coal bed gas exploiting wells for injecting water, draining water and exhausting gas in the main stress direction; arranging sealing devices for intercommunicating the two groups of exploiting wells, arranging a water injection device at the wellhead of one exploiting well, and arranging a drainage device in the other exploiting well; injecting high-pressure water into the exploiting well through the water injection device, and carrying coal dust and soft rock debris in a horizontal well to the ground through the high-pressure water; separating the discharged coal-water mixture through a coal-water separator, and storing the coal bed gas into a gas storage device; arranging a fracturing device at one exploiting well, so that the whole coal moves in one direction; guiding the coal bed gas generated by the pressure relief coal bed out of the exploiting well to the ground gas storage device; and continuously arranging a plurality of groups of wells in the main stress direction, so that the purposes of regional pressure relief and coal bed gas exploitation are fulfilled. By the method, the defects of soft, low-seepage and high-gas coal beds during conventional coal bed gas exploitation are overcome, and a technical support is provided for commercial development.
Description
Technical field
The present invention relates to soft, hypotonic, high prominent coal seam reservoirs exploitation field, especially relate to the method for physical method zone release exploiting coal bed methane.
Background technology
Coal seam pressure relief extraction gas is commonplace in China's down-hole utilization, and effect is also apparent in view.The traditional extraction technology of the many employings of ground cbm development, this development mode effect of the block that geological conditions is good is remarkable.But for soft, hypotonic, high gas, high prominent coal seam, above-mentioned extraction technology can not make the gas in the coal seam well desorb.Therefore, in the existing cbm development technology, how to carry out reaming and draw the cave, in the coal seam, shaft bottom, form and unload nip, increase the gas permeability of cracks in coal seam, to improve methane output through physics modes such as instrument reaming hole mode, negative pressure mode, blasting method or waterpower.Like one Chinese patent application number: 201010102300.2 disclosed method for exploiting coal bed gas by hydraulic drilling and pressure relieving; This method is taked at well head water filling, dewatering installation to be installed; Transfer bath robot and machinery then and draw the cave, form in the shaft bottom and unload nip with liberation coal body gas.Chinese patent number for another example: the disclosed blasting type cave well completion technological method of coal layer gas well of ZL200610047360.2; Comprise that cave explosion shaping, cave form detect, drag for 3 technical essentials of bits; Adopt the explosive initiation cavitation, the method for the clear bits in down-hole is accomplished then.
The deficiency that said method exists is to draw the cave to be limited in scope, and can not combine closely with Safety of Coal Mine Production, is inappropriate for the industrialization exploitation of large tracts of land pressure released seam gas.
Summary of the invention
The object of the invention is to provide a kind of method of physical method zone release exploiting coal bed methane.
For realizing above-mentioned purpose, the present invention can take following technical proposals:
The method of physical method zone release exploiting coal bed methane according to the invention comprises the steps:
1, construction coal-bed gas exploitation well: constructing two groups along principal direction of stress is used for the coal-bed gas exploitation well of water filling, draining, exhaust; Every group of recovery well be by two mouthfuls of well constructions, and the four-hole recovery well is the square type and distributes, and the degree of depth of every mouthful of recovery well is as the criterion to drill the coal seam, the firm basement rock of mounting sleeve around the well head of every mouthful of recovery well then, and two open barefoot completion;
2, horizontal well creeps into: in recovery well, be positioned at the position, coal seam and carry out horizontal well and creep into, utilize bearing unit that every group of recovery well connected each other;
3, water filling, closing device are installed: the well head every mouthful of recovery well is installed closing device; Water filling device is installed at pithead position place in wherein a bite recovery well of every group of recovery well; In another mouthful recovery well, dewatering installation is installed, said dewatering installation is connected with the Coal water separator on ground through pipeline;
4, high pressure coal water: in recovery well, inject water under high pressure through said water filling device, coal dust in the horizontal well and soft landwaste are carried into ground through water under high pressure, rock is stable to the horizontal channel is as the criterion;
5, moisture content of coal leaves: the coal-water mixture of discharge separates through Coal water separator, isolated water circulation use, and coal dust precipitates in sedimentation basin; The coal bed gas that produces in the drainage procedure is separated by Coal water separator and is stored in the caisson;
6, pressure break: wherein a bite recovery well or two mouthfuls of recovery well to one group of recovery well are wherein installed fracturing devices, keep the closing device of all the other recovery well, implement pressure break then, and coal body integral body is migrated to a direction;
7, gas production: after pressure break was accomplished, the coal seam output coal bed gas of release exported to the ground caisson by recovery well;
8, the The Small Well net is implemented: arrange many group wells continuously along principal direction of stress, coal body liberation zone is increased, reach regional release exploiting coal bed methane purpose.
The invention has the advantages that through the water under high pressure punching and cause discharge space to increase that the deficiency that when having overcome conventional coal seam air to open characteristic coal seams such as soft, hypotonic, high gas has been existed is for the coal seam commercial development provides technical support.The water under high pressure punching need not special high-pressure installation, and existing supercharging equipment can realize that it is simple and reliable to construct.Utilization physics is made the cave, release exploitation in coal seam makes the hole of coal body and crack increase, and impels the gas in the coal seam to desorb in a large number, to reach the purpose of ground commercialization exploiting coal bed methane, coal seam extinction, mine safety production.
Description of drawings
Fig. 1 is the layout sketch map of two groups of recovery well according to the invention.
Fig. 2 is the apparatus arrangement sketch map after wherein one group of recovery well according to the invention connects.
The whole sketch map that moves of coal body when Fig. 3 is a pressure break according to the invention.
The specific embodiment
Like Fig. 1,2, shown in 3, the method for physical method zone release exploiting coal bed methane of the present invention comprises the steps:
1, construction coal-bed gas exploitation well: constructing two groups along principal direction of stress is used for the coal-bed gas exploitation well of water filling, draining, exhaust; Every group of recovery well is by two mouthfuls of well constructions, and four-hole recovery well 1,2,3,4 is the square type and distributes, and recovery well 1,2 is one group, and recovery well 3,4 is one group; The degree of depth of every mouthful of recovery well 1,2,3,4 is as the criterion to drill coal seam 10, mounting sleeve 11 firm basement rock around the well head of every mouthful of recovery well 1,2,3,4 then, and two open barefoot completion;
2, horizontal well creeps into: in recovery well, be positioned at 10 positions, coal seam and carry out horizontal well 8 and creep into, utilize bearing unit that every group of recovery well connected each other;
3, water filling, closing device are installed: the well head in every mouthful of recovery well 1,2,3,4 is installed closing device 12; Water filling device 6 is installed at pithead position place in wherein a bite recovery well of every group of recovery well; Dewatering installation 9 is installed in another mouthful recovery well, and said dewatering installation 9 is connected with the Coal water separator 7 on ground through pipeline;
4, high pressure coal water: in recovery well 1, inject water under high pressure through said water filling device 6, coal dust and soft landwaste in the horizontal well 8 are carried into ground through water under high pressure, rock is stable to the horizontal channel is as the criterion;
5, moisture content of coal leaves: the coal-water mixture of discharge separates through Coal water separator 7, isolated water circulation use, and coal dust precipitates in sedimentation basin; The coal bed gas that produces in the drainage procedure is separated by Coal water separator 7 and is stored in the caisson 5;
6, pressure break: recovery well 2 is installed fracturing device, keep the closing device 12 of its excess-three mouth recovery well 1,3,4, implement pressure break then, coal body integral body is migrated, to a direction shown in the arrow of 10 positions, coal seam among Fig. 3;
7, gas production: after pressure break was accomplished, the coal seam 10 of release was come out the desorption of mash gas in the coal seam 10, through ground row's device for picking the gas of desorb was arranged the collection of gathering;
8, the The Small Well net is implemented: arrange many group wells continuously along principal direction of stress, coal body liberation zone is increased, reach regional release exploiting coal bed methane purpose.
Claims (1)
1. the method for a physical method zone release exploiting coal bed methane is characterized in that: comprise the steps:
One, construction coal-bed gas exploitation well: constructing two groups along principal direction of stress is used for the coal-bed gas exploitation well of water filling, draining, exhaust; Every group of recovery well be by two mouthfuls of well constructions, and the four-hole recovery well is the square type and distributes, and the degree of depth of every mouthful of recovery well is as the criterion to drill the coal seam, the firm basement rock of mounting sleeve around the well head of every mouthful of recovery well then, and two open barefoot completion;
Two, horizontal well creeps into: in recovery well, be positioned at the position, coal seam and carry out horizontal well and creep into, utilize bearing unit that every group of recovery well connected each other;
Three, water filling, closing device are installed: the well head every mouthful of recovery well is installed closing device; Water filling device is installed at pithead position place in wherein a bite recovery well of every group of recovery well; In another mouthful recovery well, dewatering installation is installed, said dewatering installation is connected with the Coal water separator on ground through pipeline;
Four, high pressure coal water: in recovery well, inject water under high pressure through said water filling device, coal dust in the horizontal well and soft landwaste are carried into ground through water under high pressure, rock is stable to the horizontal channel is as the criterion;
Five, moisture content of coal leaves: the coal-water mixture of discharge separates through Coal water separator, isolated water circulation use, and coal dust precipitates in sedimentation basin; The coal bed gas that produces in the drainage procedure is separated by Coal water separator and is stored in the caisson;
Six, pressure break: wherein a bite recovery well or two mouthfuls of recovery well to one group of recovery well are wherein installed fracturing devices, keep the closing device of all the other recovery well, implement pressure break then, and coal body integral body is migrated to a direction;
Seven, gas production: after pressure break was accomplished, the coal seam output coal bed gas of release exported to the ground caisson by recovery well;
Eight, the The Small Well net is implemented: arrange many group wells continuously along principal direction of stress, coal body liberation zone is increased, reach regional release exploiting coal bed methane purpose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101836642A CN102383773A (en) | 2011-07-01 | 2011-07-01 | Method for exploiting coal bed gas by physical regional pressure relief |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101836642A CN102383773A (en) | 2011-07-01 | 2011-07-01 | Method for exploiting coal bed gas by physical regional pressure relief |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102383773A true CN102383773A (en) | 2012-03-21 |
Family
ID=45823560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101836642A Pending CN102383773A (en) | 2011-07-01 | 2011-07-01 | Method for exploiting coal bed gas by physical regional pressure relief |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102383773A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213896A (en) * | 2014-09-01 | 2014-12-17 | 中国石油大学(北京) | Fracturing and cavern integrated completion method for coal-bed gas reservoir |
| CN104594868A (en) * | 2015-01-29 | 2015-05-06 | 河南理工大学 | Multi-point control hydraulic fracturing, permeability-increasing and outburst-eliminating method |
| CN107476783A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN107575263A (en) * | 2017-09-30 | 2018-01-12 | 太原理工大学 | A kind of device of underground heat injection enhanced gas extraction gas |
| CN108843241A (en) * | 2018-04-28 | 2018-11-20 | 中国矿业大学 | A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining system |
| CN110273685A (en) * | 2019-06-13 | 2019-09-24 | 太原理工大学 | Method microwave heating H formula abatement thick and hard roof and leave the compound strong mine pressure of coal column |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090321080A1 (en) * | 2006-07-06 | 2009-12-31 | Compressed Energy Technology As | System, vessel and method for production of oil and heavier gas fractions from a resevoir below the seabed |
| CN101775974A (en) * | 2010-01-28 | 2010-07-14 | 郑州大学 | Method for exploiting coal bed methane (CBM) by water transportation and pressure relief in butted well |
| CN101915083A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting coalbed gases from coal mines by upper and lower combination |
-
2011
- 2011-07-01 CN CN2011101836642A patent/CN102383773A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090321080A1 (en) * | 2006-07-06 | 2009-12-31 | Compressed Energy Technology As | System, vessel and method for production of oil and heavier gas fractions from a resevoir below the seabed |
| CN101775974A (en) * | 2010-01-28 | 2010-07-14 | 郑州大学 | Method for exploiting coal bed methane (CBM) by water transportation and pressure relief in butted well |
| CN101915083A (en) * | 2010-08-13 | 2010-12-15 | 山西晋城无烟煤矿业集团有限责任公司 | Method for extracting coalbed gases from coal mines by upper and lower combination |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213896A (en) * | 2014-09-01 | 2014-12-17 | 中国石油大学(北京) | Fracturing and cavern integrated completion method for coal-bed gas reservoir |
| CN104594868A (en) * | 2015-01-29 | 2015-05-06 | 河南理工大学 | Multi-point control hydraulic fracturing, permeability-increasing and outburst-eliminating method |
| CN107476783A (en) * | 2016-06-08 | 2017-12-15 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN107476783B (en) * | 2016-06-08 | 2019-09-06 | 中国石油天然气股份有限公司 | A kind of bottom plate develops the coalbed methane reservoir remodeling method of rotten rib coal |
| CN107575263A (en) * | 2017-09-30 | 2018-01-12 | 太原理工大学 | A kind of device of underground heat injection enhanced gas extraction gas |
| CN108843241A (en) * | 2018-04-28 | 2018-11-20 | 中国矿业大学 | A kind of deformation coal original position coal bed gas horizontal well cave Depressurized mining system |
| CN110273685A (en) * | 2019-06-13 | 2019-09-24 | 太原理工大学 | Method microwave heating H formula abatement thick and hard roof and leave the compound strong mine pressure of coal column |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101915083B (en) | Method for extracting coalbed gases from coal mines by upper and lower combination | |
| CN102383773A (en) | Method for exploiting coal bed gas by physical regional pressure relief | |
| CN102168575B (en) | Loose blasting gas extraction technology for horizontal branch well of coal seam floor | |
| CN101775974B (en) | Method for exploiting coal bed methane (CBM) by water transportation and pressure relief in butted well | |
| CN103883293B (en) | Hydraulic jet radial drilling and fracturing integrating method | |
| CN101251028A (en) | Method for taking out and picking high gassy seam group dislodging gob-side entry retaining Y type ventilated decompression firedamp | |
| CN107905834A (en) | A kind of hypotonic high prominent coal seam architecture gas production method | |
| CN107401393A (en) | Water pumping gas production integration goaf gas extraction well casing programme and its construction method | |
| CN103790589B (en) | Transition connection mining technique from outdoor mine to underground mine | |
| CN104712358A (en) | Coal seam group with high gas content pressure relief and co-mining method based on gob-side entry retaining of working face of first mining total rock pressure relief | |
| CN102392678A (en) | Gas drainage method combining surface and underground fracturing and permeability improvement | |
| CN104131831A (en) | Coal-bed gas well vertical three-dimensional united extraction method | |
| CN109519211B (en) | Method for extracting gas in mining area by using pre-extraction coal bed gas ground well | |
| CN104405283A (en) | Technique for extracting gas from L-shaped ground drilling well in mining area | |
| CN104533296B (en) | Drill bit used for exploiting combustible ice | |
| CN102493831A (en) | Method for extracting coal seam gas through ground fracturing and underground horizontal drill holes | |
| CN102518412A (en) | Method for mining coal and gas by hydraulic jet grouting washout | |
| CN104895531A (en) | Single thick coal seam ground mining well extraction process | |
| CN109209474A (en) | A kind of method that dual-lateral well extracts lower coal seam and top more goaf gas and ponding | |
| CN108180040A (en) | A kind of salt hole air reserved storeroom dual string makes cavity method | |
| CN108301866A (en) | Mining of closed distance coal seam group adjacent layer gas pressure relief directional drilling stops pumping method | |
| CN111022108A (en) | Method for extracting gas in goaf | |
| CN102434192A (en) | Device and method for enhancing coal seam fracturing effect | |
| CN105971563B (en) | A kind of lower part tool post method exploits the pumping method for the compound old dead zone coal bed gas to be formed | |
| CN105019935A (en) | Overground/underground combined pressure relief outburst elimination coal seam rapid channel digging method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120321 |